I wonder how they two cope with inability to have children but I guess such things like their first sex won't be detailed in manga ^^
Also, Tachibana uncle is coming in search for Fountain of Psyche - what that could be? Perhaps it is somehow tied to Karin or to Anju?
And no new vampire was born in last 12 years... I wonder why is that, is Calera only one of them who is fertile now? Who was her father?
So many questions and few aswers, gotta read more now!